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In 1987 the revised third edition of the Diagnostic and Statistical Manual of Mental Disorders (Washington, D.C.: American Psychiatric Press) distinguished delusional (paranoid) disorder from paranoid schizophrenia. Delusional disorder was defined as a persistent specific delusion not accompanied by the deterioration in personality and negative symptoms of anhedonia, lack of motivation, and social withdrawal that characterize chronic schizophrenia. The variations in the content of the delusion itself prompted further subtyping of the disorder, according to feelings of persecution, somatic preoccupations (e.g., body abnormalities, infestation by insects, and emission of foul odors), jealousy, erotomania, and grandiosity. The prevalence of these disorders
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